Hi Peter,
We rode the GRR from west to east last August on loaded up WR250Rs. This is late in the dry season and the road was really good on these bikes. We had no problem with soft sand until we tried to go north up to Kalumburu on the Mitchell Plateau (didn't make it to Kalumburu).
Bear in mind the Kimberley have had their wettest wet for some time - road closed to all traffic at the moment and likely to have some decent river crossings and muddy tracks for a few months at least.
We carried a maximum of 15L of fuel each and managed - needed to track back to Mt Barnett Roadhouse to re-fuel when we took a side trip to Mornington (some 100km off the Gibb). Beautiful riding through this country.
From my notes....
Derby to Mt Barnett is approx 375km
Mt Barnett to Mornington return trip is approx 290km
Drysdale to Kalumburu is approx 470km
Imitji Roadhouse only sell diesel
Let me know if you have any other questions - the gibbriverroad website listed above has plenty of useful info
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